21404442402 has 32 divisors (see below), whose sum is σ = 54360489600. Its totient is φ = 6115554864.

The previous prime is 21404442383. The next prime is 21404442403. The reversal of 21404442402 is 20424440412.

21404442402 is a `hidden beast` number, since 214 + 0 + 4 + 4 + 42 + 402 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21404442403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28312377 + ... + 28313132.

It is an arithmetic number, because the mean of its divisors is an integer number (1698765300).

Almost surely, 2^21404442402 is an apocalyptic number.

21404442402 is an abundant number, since it is smaller than the sum of its proper divisors (32956047198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21404442402 is a wasteful number, since it uses less digits than its factorization.

21404442402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56625527 (or 56625521 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 27.

Adding to 21404442402 its reverse (20424440412), we get a palindrome (41828882814).

The spelling of 21404442402 in words is "twenty-one billion, four hundred four million, four hundred forty-two thousand, four hundred two".